Image analysis – Image compression or coding – Transform coding
Patent
1998-09-15
2000-12-12
Tran, Phuoc
Image analysis
Image compression or coding
Transform coding
382233, 382251, G06K 936, G06K 946
Patent
active
06160920&
ABSTRACT:
In order to reduce the number of multiplication operations in a video compressing apparatus, a predetermined original quantizer matrix is compensated with a set of scaling coefficients derived from a sixth intrinsic multiplication stage of a discrete cosine transform (DCT) fast algorithm to obtain a modified quantizer matrix. Thereafter, a DCT unit is configured to perform DCT on an input data block based on the DCT fast algorithm while dispensing with the sixth intrinsic multiplication stage of the DCT fast algorithm to result in scaled transform data. A quantizer is configured so as to quantize the scaled transform data in accordance with the modified quantizer matrix. To reduce the number of multiplication operations in a video decompressing apparatus, a predetermined original dequantizer matrix is compensated with a set of pre-scaling coefficients derived from a first intrinsic multiplication stage of an IDCT fast algorithm to obtain a modified dequantizer matrix. Thereafter, an inverse quantizer is configured so as to dequantize input quantized DCT data in accordance with the modified dequantizer matrix. An IDCT unit is configured to perform IDCT on the output of the inverse quantizer based on the IDCT fast algorithm while dispensing with the first intrinsic multiplication stage of the IDCT fast algorithm.
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Tran Phuoc
Winbond Electronics Corp.
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